So, what shall / will / must be used with impersonal narrative?
A double negative in the English language shall result in a positive, a bit like multiplication, but there is no language in this world, apart from Russian slang where a double positive will result in a negative. "Aye, right!"
Sorry, I just felt like adding a post to get 3 points - I really need them because my under 16 football team got beaten again today ... and I'll take 3 points from anywhere.